CO and NO2 Selective Monitoring by ZnO-Based Sensors

Nanomaterials

Mokhtar Hjiri¹  Lassaad El Mir¹  Salvatore Gianluca Leonardi²  Nicola Donato² 

[1]Laboratory of Physics of Materials and Nanomaterials Applied at the Environment, Faculty of Sciences, University of Gabes, Gabes 6072, Tunisia

[2] E-Mails:

[3]Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Messina 98166, Italy

[4] E-Mails:

关键词: ZnO;    nanoparticles;    nanofibers;    gas sensor;    CO;    NO₂;    sol-gel;    electrospinning;   

DOI  :  10.3390/nano3030357

来源: mdpi

【 摘 要 】

ZnO nanomaterials with different shapes were synthesized, characterized and tested in the selective monitoring of low concentration of CO and NO₂ in air. ZnO nanoparticles (NPs) and nanofibers (NFs) were synthesized by a modified sol-gel method in supercritical conditions and electrospinning technique, respectively. CO and NO₂ sensing tests have demonstrated that the annealing temperature and shape of zinc oxide nanomaterials are the key factors in modulating the electrical and sensing properties. Specifically, ZnO NPs annealed at high temperature (700 °C) have been found sensitive to CO, while they displayed negligible response to NO₂. The opposite behavior has been registered for the one-dimensional ZnO NFs annealed at medium temperature (400 °C). Due to their adaptable sensitivity/selectivity characteristics, the developed sensors show promising applications in dual air quality control systems for closed ambient such as automotive cabin, parking garage and tunnels.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.